1) Yes, I drilled/c'sunk holes in the extrusion:
2) I cut the heads off of the dovetail bar fasteners and made set screws out of them. I would have just bought some set screws, but, damn metric! If I had to do it again I would have bought new longer metric bolts to make the set screws.
3) Another mod is you need to grind about 1/8" off of the flapper/clamping bar on the fence. Otherwise it will hit the extrusion. I had a spare bar so had no fear making this mod - it works great.
Mike